[jarfil]

Some people know several languages, but it's difficult to learn a locale well enough to 100% touch type when you only have a keyboard in a single locale, and don't use some of the languages as often as others.

Also, per-software layers with action icons instead of learning alphabetic shortcuts.

[masklinn]

It's also difficult to know all alternate layouts by heart e.g. Apple's US International has 4 different layout (shifted, alted and alt-shifted), and while being able to type "˚" directly can be convenient I literally never remember it's alt-k, so I hunt through basically all the alt-ed layout until I find it.